| 摘要 |
A three-way pilot-control valve (10) closed only in the rest position for supplying a fluid-flow control valve, for example a four-, three-, two-way directional control valve or the like, with operating compressed air for adjusting the main control spool of such valves has a valve housing (11) with an inlet port (13) for operating compressed air, a cylinder connection (21) and an outlet port (28). The inlet port is connected via a first channel (groove 14, bore 15, passages 19, groove 20) to the cylinder connection (21), which is connected to the outlet port (28) via a second channel (bore 24, passages 25, outlet chamber 26, channel 27). In the valve housing (11), a disc control slide (39) is movably arranged between a rest position in which it blocks the first channel (14, 15, 19, 20) and a working position in which it opens the first channel (14, 15, 19, 20) and blocks the second channel (24, 25, 26, 27). The disc control slide (39) can be put back into the rest position by a resetting device (resetting spring 41, air channel 42) acting by spring force with air assistance and can be moved into the working position by an electromagnet. The disc control slide (39) is provided with only one dynamic sealing member (50). The pilot-control valve (10) has two sharp-edged valve seats (47, 48) arranged at a distance apart in the longitudinal direction on which two annular valve closure members (45, 46) arranged at a distance apart in the longitudinal direction can be brought to bear alternately against the disc control slide (39) when the disc control slide (39) is moved between the working and rest positions. <IMAGE>
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